The sisters live in their mother's house in Symsonia, Kentucky, where they grew up. They've spent their lives in this town, except for the World War II years when their husband went off to battle and they headed up to Detroit to work in wartime factories.

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Twins celebrate their 100th birthday

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Identical twins remain inseparable as they celebrate turning 100

(Photo credit: INSIDE EDITION)

(Photo credit: INSIDE EDITION)

(Photo credit: INSIDE EDITION)

(Photo credit: INSIDE EDITION)

(Photo credit: INSIDE EDITION)

(Photo credit: INSIDE EDITION)

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Mary said she considered herself "Rosie the Riveter," but her employers did not. "I couldn't rivet very well, "she concedes, and so she was reassigned.

"We were just little country girls that went to the big city," she said. And the sisters took in everything they could – museums, movies, dances. "We saw every big band that came to the city," she says proudly.

The sisters in Detroit in the 1940s.

After the war, back home in northeastern Kentucky, the sisters taught school. Their classrooms were just across the hall from each other. They had children. They got older. Their kids grew up and moved away. Their husbands died.

They decided to share their mother's house, which sits next door to their church. Every morning, they go the church's gym, where they walk for 30 minutes. "We used to walk an hour a day," says May.

Niece Judy Lyles says the women "mowed their own yards until two years ago." They gave up driving last year. Friends, family and church folk take them where they need to go and bring over food and whatnot.

It's not unusual for the sisters to come home to find that their cupboards have been filled by members of their church.